参数资料
型号: SAB80C517A-N18-T3
厂商: INFINEON TECHNOLOGIES AG
元件分类: 微控制器/微处理器
英文描述: 8-BIT, 18 MHz, MICROCONTROLLER, PQCC84
封装: PLASTIC, LCC-84
文件页数: 2/137页
文件大小: 2089K
代理商: SAB80C517A-N18-T3
Semiconductor Group
3 - 2
Memory Organization
3.1
Program Memory, ROM Protection
The SAB 83C517A-5 has 32 Kbyte of on-chip ROM, while the SAB 80C517A has no internal
ROM. The program memory can externally be expanded up to 64 Kbyte. Pin EA controls whether
program fetches below address 8000H are done from internal or external memory.
As a new feature the SAB 83C517A-5 offers the possibillity of protecting the internal ROM against
unauthorized access. This protection is implemented in the ROM-Mask. Therefore, the decision
ROM-Protection ’yes’ or ’no’ has to be made when delivering the ROM-Code. Once enabled, there
is no way of disabling the ROM-Protection.
Effect : The access to internal ROM done by an externally fetched MOVC instruction is disabled.
Nevertheless, an access from internal ROM to external ROM is possible.
To verify the read protected ROM-Code a special ROM-Verify-Mode is implemented. This mode
also can be used to verify unprotected internal ROM.
ROM-Protection
ROM-Verification Mode
(see ’AC Characteristics’)
Restrictions
no
ROM-Verification Mode 1
(standard 8051 Verification Mode)
ROM-Verification Mode 2
yes
ROM-Verification Mode 2
– standard 8051 Verification
Mode is disabled
– externally applied MOVC
accessing to internal ROM
is disabled
相关PDF资料
PDF描述
SAB83C517A-N18-T4 8-BIT, 18 MHz, MICROCONTROLLER, PQCC84
SAB80C517A-S18-T3 8-BIT, 18 MHz, MICROCONTROLLER, PQFP100
SAB83C517A-5S18-T3 8-BIT, MROM, 18 MHz, MICROCONTROLLER, PQFP100
SAB83C517A-5S18-T4 8-BIT, MROM, 18 MHz, MICROCONTROLLER, PQFP100
SAB80C517A-S18-T3 8-BIT, 18 MHz, MICROCONTROLLER, PQFP100
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